项目实战-物联网平台搭建-MQTT_android客户端（四）

以你之姓@ 2022-12-19 06:15 576阅读 0赞

**MQTT安卓客户端开发目的：**

1.作为发布者测试mqtt服务器

2.作为接受者监测发布者数据

3.将接收数据图像化

安卓初学者

先简单展示一下，折线图会实时更新所订阅主题的信息

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1clFR_size_16_color_FFFFFF_t_70][]

折线图部分使用MPAndroidChart

github地址：[https://github.com/PhilJay/MPAndroidChart][https_github.com_PhilJay_MPAndroidChart]

主界面：

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1clFR_size_16_color_FFFFFF_t_70 1][]

主界面xml文件：

<?xml version="1.0" encoding="utf-8"?>
    <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
        xmlns:app="http://schemas.android.com/apk/res-auto"
        xmlns:tools="http://schemas.android.com/tools"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        tools:context=".MQTT">
    
        <com.github.mikephil.charting.charts.LineChart
            android:id="@+id/chart"
            android:layout_marginTop="20dp"
            android:layout_width="match_parent"
            android:layout_height="200dp"
            android:background="#ffffff"
            />
        <TextView
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="服务器："
            android:textSize="25sp"
            android:textStyle="bold"
            android:id="@+id/fuwuqi"
            android:layout_marginTop="250dp"
            android:layout_marginLeft="10dp"
            />
        <EditText
            android:id="@+id/fuwuqi_"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_toRightOf="@+id/fuwuqi"
            android:layout_marginTop="250dp"
            android:layout_marginLeft="10dp"
            android:width="185dp"
            android:height="40dp"
            android:hint="地址"
            />
    
        <TextView
            android:id="@+id/zhuti"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="主题："
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/mima"
            android:layout_marginTop="20dp"
            android:layout_marginLeft="10dp"
                                    />
        <EditText
            android:id="@+id/zhuti_"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_toRightOf="@+id/zhuti"
            android:layout_alignBottom="@+id/zhuti"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:width="210dp"
            android:height="40dp"
            android:hint="主题"
            />
    
        <TextView
            android:id="@+id/yonghuming"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="用户名："
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/fuwuqi"
            android:layout_marginTop="15dp"
            android:layout_marginLeft="10dp"
            />
        <EditText
            android:id="@+id/yonghuming_"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_toRightOf="@+id/yonghuming"
            android:layout_alignBottom="@+id/yonghuming"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:width="185dp"
            android:height="40dp"
            android:hint="admin"
            />
        <TextView
            android:id="@+id/mima"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="密码："
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/yonghuming"
            android:layout_marginTop="15dp"
            android:layout_marginLeft="10dp"
            />
        <EditText
            android:id="@+id/mima_"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_toRightOf="@+id/mima"
            android:layout_alignBottom="@+id/mima"
            android:layout_marginTop="10dp"
            android:layout_marginLeft="10dp"
            android:width="210dp"
            android:height="40dp"
            android:hint="密码"
            />
        <Button
            android:id="@+id/button"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="连接"
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_marginTop="250dp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="5dp"
            android:width="20dp"
            android:height="140dp"
            />
        <Button
            android:id="@+id/button1"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="订阅"
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/button"
            android:layout_marginTop="10dp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="5dp"
            />
        <Button
            android:id="@+id/button2"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="发送"
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/button1"
            android:layout_marginTop="10dp"
            android:layout_alignParentRight="true"
            android:layout_marginRight="5dp"
            android:height="150dp"
            />
        <TextView
            android:id="@+id/xuanze"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="选择主题"
            android:textSize="25sp"
            android:textStyle="bold"
            android:layout_below="@+id/zhuti"
            android:layout_marginTop="20dp"
            android:layout_marginLeft="10dp"
            />
        <EditText
            android:id="@+id/fa"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="15sp"
            android:textStyle="bold"
            android:layout_below="@+id/xuanze"
            android:layout_marginLeft="10dp"
            android:width="300dp"
            android:height="50dp"
            android:hint="发送框："
            />
        <TextView
            android:id="@+id/shou"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textSize="20sp"
            android:textStyle="bold"
            android:layout_below="@+id/fa"
            android:layout_marginLeft="10dp"
            android:width="300dp"
            android:height="75dp"
            android:text="接收框："
            />
        <Spinner
            android:id="@+id/spinner"
            android:layout_below="@+id/zhuti_"
            android:layout_toRightOf="@+id/xuanze"
            android:layout_width="180dp"
            android:layout_marginTop="20dp"
            android:layout_marginLeft="15dp"
            android:layout_height="30dp"
            />
    
    
    
    </RelativeLayout>

后端

MQTTservice,java

/**
     * MQTT长连接服务
     * Created by cym1497 on 2017/7/10.
     */
    public class MQTTService extends Service {
    
        public static final String TAG = MQTTService.class.getSimpleName();
        private static MQTTService instance;
        private static MqttAndroidClient client;
    
        private MqttConnectOptions conOpt;
        public static String mytopic;
    
    
        @Override
        public void onCreate() {
            super.onCreate();
            instance = this;
        }
    
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {
            init();
            return super.onStartCommand(intent, flags, startId);
        }
    
        @Nullable
        @Override
        public IBinder onBind(Intent intent) {
            return null;
        }
    
        @Override
        public void onDestroy() {
            instance = null;
            try {
                client.disconnect();
                client.unregisterResources();
    
            } catch (MqttException e) {
                e.printStackTrace();
            }
            super.onDestroy();
        }
    
        public static void publish(String myTopic,String msg){
            String topic = myTopic;
            Integer qos = 0;
            Boolean retained = false;
            try {
                client.publish(topic, msg.getBytes(), qos.intValue(), retained.booleanValue());
            } catch (MqttException e) {
                e.printStackTrace();
            }
        }
    
    
        // MQTT监听连接情况
        private IMqttActionListener iMqttActionListener = new ActionListener();
    
        // MQTT监听并且接受消息
        private MqttCallback mqttCallback = new CallBack();
    
        private void init() {
            MQTT.clientId = MacAddressUtil.getLocalMacAddress(this);
    
            // 服务器地址（协议+地址+端口号）
            String uri = MQTT.host;
            client = new MqttAndroidClient(this, uri, MQTT.clientId);
            // 设置MQTT监听并且接受消息
            client.setCallback(mqttCallback);
    
            conOpt = new MqttConnectOptions();
            // 清除缓存
            conOpt.setCleanSession(true);
            // 设置超时时间，单位：秒
            conOpt.setConnectionTimeout(10);
            // 心跳包发送间隔，单位：秒
            conOpt.setKeepAliveInterval(20);
            // 用户名
            conOpt.setUserName(MQTT.userName);
            // 密码
            conOpt.setPassword(MQTT.passWord.toCharArray());
    
            // last will message
            boolean doConnect = true;
    //        String message = "{\"terminal_uid\":\"" + MQTT.clientId + "\"}";
    //        String topic = MQTT.myTopic;
    //        Integer qos = 0;
    //        Boolean retained = false;
    //        if (TextUtils.isEmpty(message) || TextUtils.isEmpty(topic)) {
    //            // 最后发送的消息
    //            try {
    //                conOpt.setWill(topic, message.getBytes(), qos.intValue(), retained.booleanValue());
    //            } catch (Exception e) {
    //                Log.i(TAG, "Exception Occured", e);
    //                doConnect = false;
    //                iMqttActionListener.onFailure(null, e);
    //            }
    //        }
    //
            if (doConnect) {
                doClientConnection();
            }
    
        }
    
        /** 连接MQTT服务器 */
        private void doClientConnection() {
            if (!client.isConnected() && isConnectIsNomarl()) {
                try {
                    client.connect(conOpt, null, iMqttActionListener);
                } catch (MqttException e) {
                    e.printStackTrace();
                }
            }
        }
    
        /** 判断网络是否连接 */
        private boolean isConnectIsNomarl() {
            ConnectivityManager connectivityManager = (ConnectivityManager) this.getApplicationContext().getSystemService(Context.CONNECTIVITY_SERVICE);
            NetworkInfo info = connectivityManager.getActiveNetworkInfo();
            if (info != null && info.isAvailable()) {
                String name = info.getTypeName();
                Log.i(TAG, "MQTT当前网络名称：" + name);
                return true;
            } else {
                Log.i(TAG, "MQTT 没有可用网络");
                return false;
            }
        }
    
        public static boolean isConnect(){
            if (instance != null && client != null){
                return instance.client.isConnected();
            }
            return false;
        }
    
        public static void connect(){
            if (instance != null && client != null){
                instance.doClientConnection();
            }
        }
    
        public static void disconnect(){
            if (instance != null){
                try {
                    instance.client.disconnect();
                } catch (MqttException e) {
                    e.printStackTrace();
                }
            }
        }
    
        public static class ActionListener implements IMqttActionListener {
    
            @Override
            public void onSuccess(IMqttToken arg0) {
                Log.i(TAG, "连接成功 ");
    //            try {
    //                // 订阅myTopic话题
    //                client.subscribe(MQTT.myTopic,1);
    //            } catch (MqttException e) {
    //                e.printStackTrace();
    //            }
    
            }
    
            @Override
            public void onFailure(IMqttToken arg0, Throwable arg1) {
                arg1.printStackTrace();
                // 连接失败，重连
                Log.i("mtqq", "连接失败");
            }
        }
    
    
        public static class CallBack implements MqttCallback {
    
            @Override
            public void messageArrived(String topic, MqttMessage message) throws Exception {
                mytopic = topic;
                String str1 = new String(message.getPayload());
                MQTTMessage msg = new MQTTMessage();
                msg.setMessage(str1);
                EventBus.getDefault().post(msg);
                String str2 = "topic1:" + topic+ ", qos:" + message.getQos() + ", retained:" + message.isRetained();
                Log.i(TAG, "messageArrived:" + str1);
                Log.i(TAG, str2);
            }
    
            @Override
            public void deliveryComplete(IMqttDeliveryToken arg0) {
                Log.i("mtqq", "deliveryComplete");
            }
    
            @Override
            public void connectionLost(Throwable arg0) {
                // 失去连接，重连
                String message = "null";
                if (arg0 != null) {
                    message = arg0.getMessage();
                }
                Log.i("mtqq", "connectionLost:"+message);
            }
        }
    
        //订阅消息
        public void dingyue(String myTopic){
                 try {
                    // 订阅myTopic话题
                    client.subscribe(myTopic,1);
                } catch (MqttException e) {
                    e.printStackTrace();
                }
    
        }
    }

MQTT.java

public class MQTT extends AppCompatActivity implements View.OnClickListener{
    
        public static String host ;//= "tcp://123.56.96.198:1883";
        public static String userName = "admin";
        public static String passWord = "password";
        public static String myTopic ;
        public static String clientId = "test2";
        private static EditText fuwuqi;
        private static EditText zhuti;
        private static TextView shou;
        private static TextView yonghuming;
        private static TextView mima;
        private static Button button;
        private static EditText fa;
        private static boolean linjie=false;
        private static MqttAndroidClient client;
        private static MQTTService mqttService = new MQTTService();
    
        private Spinner spinner;
        private List<String> data_list;
        private ArrayAdapter<String> arr_adapter;
    
    
        private static LineChart chart ;
        private static List<Integer> a;
        private static boolean aa = true;
        private static boolean aaa =false;
    
        
    
      /*  private EditText fuwuqi ;
        private Button button;
        private Button button1;
        private EditText zhuti;
    
       */
    
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_m_q_t_t);
            spinner = (Spinner) findViewById(R.id.spinner);
            chart = (LineChart) findViewById(R.id.chart);
            a = new ArrayList<Integer>();
    
    
            //折线图
    
    
            /*
            chart = findViewById(R.id.chart);
            ArrayList<Entry> valsComp1 = new ArrayList<Entry>();
            ArrayList<Entry> valsComp2 = new ArrayList<Entry>();
            Entry c1e1 = new Entry(100.000f, 0); // 0 == quarter 1
            valsComp1.add(c1e1);
            Entry c1e2 = new Entry(50.000f, 1);  // 1 == quarter 2 ...
            valsComp1.add(c1e2);
            // and so on ...
    
            Entry c2e1 = new Entry(120.000f, 0); // 0 == quarter 1
            valsComp2.add(c2e1);
            Entry c2e2 = new Entry(110.000f, 1); // 1 == quarter 2 ...
            valsComp2.add(c2e2);
            LineDataSet setComp1 = new LineDataSet(valsComp1, "Company 1");
            setComp1.setAxisDependency(YAxis.AxisDependency.LEFT);
            LineDataSet setComp2 = new LineDataSet(valsComp2, "Company 2");
            setComp2.setAxisDependency(YAxis.AxisDependency.LEFT);
            //...
            ArrayList<LineDataSet> dataSets = new ArrayList<LineDataSet>();
            dataSets.add(setComp1);
           // dataSets.add(setComp2);
    
            ArrayList<String> xVals = new ArrayList<String>();
            xVals.add("1.Q"); xVals.add("2.Q"); xVals.add("3.Q"); xVals.add("4.Q");
    
            LineData data = new LineData(setComp2);
            chart.setData(data);
            chart.invalidate();
            */
            //ChartUtils c = new ChartUtils();
            //c.setChartData(chart,valsComp2);
    
            //XAxis xAxis = chart.getXAxis();
    //        chart.setOnChartValueSelectedListener(this);
            //chart.setBackgroundColor(0xff00ff00);//设置背景颜射
            //chart.invalidate();//刷新
            //chart.setDescription(a);//设置右下文字
            //chart.setMaxVisibleValueCount(10);//设置最大可绘制数量
    
    
    
            //数据
            data_list = new ArrayList<String>();
            data_list.add("下拉选择");
    
            //适配器
            arr_adapter= new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, data_list);
            //设置样式
            arr_adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
            //加载适配器
            spinner.setAdapter(arr_adapter);
            /*
            button = findViewById(R.id.button);
            fuwuqi = findViewById(R.id.fuwuqi_);
            button1 = findViewById(R.id.button1);
            zhuti = findViewById(R.id.zhuti_);
    
            */
            shou = findViewById(R.id.shou);
            fuwuqi = findViewById(R.id.fuwuqi_);
            yonghuming = findViewById(R.id.yonghuming_);
            mima = findViewById(R.id.mima_);
            button = findViewById(R.id.button);
            zhuti = findViewById(R.id.zhuti_);
            fa = findViewById(R.id.fa);
    
    
            EventBus.getDefault().register(this);
    
            findViewById(R.id.button).setOnClickListener(this);
            findViewById(R.id.button1).setOnClickListener(this);
            findViewById(R.id.button2).setOnClickListener(this);
    
    
        }
    
        private boolean isServiceRunning() {
            return ServiceUtil.isServiceWork(this, MQTTService.class.getName());
        }
    
        @Override
        public void onClick(View v) {
            boolean isRunning = isServiceRunning();
            switch (v.getId()){
                case R.id.button:
    
                    if(TextUtils.isEmpty(fuwuqi.getText())&&!linjie) {
                        Toast toast=Toast.makeText(getApplicationContext(), "请输入服务器地址", Toast.LENGTH_SHORT);
                        toast.show();
                    }else if(linjie){
                        button.setText("连接");
                        linjie=false;
                        if (!isRunning){
                            ToastUtil.showToast(this, "MQTT Service stopped");
                        } else {
                            ToastUtil.showToast(this, "MQTT Service stopping");
                            stopService(new Intent(this, MQTTService.class));
                        }
                }else{
                        linjie =true;
                        if(!(TextUtils.isEmpty(yonghuming.getText()))) {
                            userName = yonghuming.getText().toString();
                        }
                        if(!(TextUtils.isEmpty(mima.getText()))) {
                            passWord = mima.getText().toString();
                        }
                        button.setText("断开");
                         host = fuwuqi.getText().toString();
                         System.out.println(host);
                        if (isRunning) {
                            ToastUtil.showToast(this, "MQTT Service started");
                        } else {
                            ToastUtil.showToast(this, "MQTT Service starting !");
                            startService(new Intent(this, MQTTService.class));
                        }
                    }
                    break;
    /*
                case R.id.stop:
                    if (!isRunning){
                        ToastUtil.showToast(this, "MQTT Service stopped");
                    } else {
                        ToastUtil.showToast(this, "MQTT Service stopping");
                        stopService(new Intent(this, MQTTService.class));
                    }
                    break;
                    */
    
                case R.id.button1:
                    if (!isRunning){
                        ToastUtil.showToast(this, "please start MQTT Service");
                        break;
                    }
                    if (MQTTService.isConnect()) {
                        if(TextUtils.isEmpty(zhuti.getText())) {
                            ToastUtil.showToast(this, "请输入主题");
                            break;
                        }else {
                            myTopic = zhuti.getText().toString();
    
                            for (int i = 0; i < data_list.size(); i++) {
                                if(data_list.get(i).equals(myTopic)){
                                    System.out.println(data_list.get(i));
                                    ToastUtil.showToast(this, "该主题已经订阅");
                                }else if (i==(data_list.size()-1)){
                                    data_list.add(myTopic);
                                }
                                //System.out.println(data_list.get(i));
                            }
                            //data_list.add(myTopic);
                            System.out.println(myTopic);
    
                            mqttService.dingyue(myTopic);
    
                            ToastUtil.showToast(this, "MQTT Service connected");
                            MQTTService.connect();
                            break;
                        }
                    }
                        ToastUtil.showToast(this, "MQTT Service connecting");
                    break;
    
              /*  case R.id.disconnect:
                    if (!isRunning){
                        ToastUtil.showToast(this, "please start MQTT Service");
                        break;
                    }
    
                    if (!MQTTService.isConnect()){
                        ToastUtil.showToast(this, "MQTT Service disconnected");
                        break;
                    }
                    ToastUtil.showToast(this, "MQTT Service disconnecting");
                    MQTTService.disconnect();
                    break;*/
    
                case R.id.button2:
                    if (!isRunning){
                        ToastUtil.showToast(this, "please start MQTT Service");
                        break;
                    }
    
                    if (!MQTTService.isConnect()){
                        ToastUtil.showToast(this, "please connect");
                        break;
                    }
                    if(!(TextUtils.isEmpty(fa.getText()))){
                        MQTTService.publish((String) spinner.getSelectedItem(),fa.getText().toString());
                        break;
                    }else{
                        ToastUtil.showToast(this, "请发送输入内容");
                        break;
                    }
    
    
            }
    
        }
        @Subscribe(threadMode = ThreadMode.MAIN)
        public void getMqttMessage(MQTTMessage mqttMessage) {
    
            String message = mqttMessage.getMessage();
            System.out.println(MQTTService.mytopic);
            System.out.println(spinner.getSelectedItem());
            if (MQTTService.mytopic.toString().equals(spinner.getSelectedItem().toString())&&MQTTService.mytopic.toString().equals(data_list.get(1))) { //spinner.getSelectedItem().toString()
                aaa=true;
                if(aa) {
                    for (int i = 0; i < a.size(); i++)
                    {
                        a.remove(i);
                    }
                     aa=false;
                 }
                a.add(Integer.parseInt(message));
                initLineChart(a);
                shou.setText(message);
            }else if (MQTTService.mytopic.toString().equals(spinner.getSelectedItem().toString())&&MQTTService.mytopic.toString().equals(data_list.get(2))) { //spinner.getSelectedItem().toString()
                aaa=true;
                if(!aa) {
                    for (int i = 0; i < a.size(); i++)
                    {
                        a.remove(i);
                    }
                    aa=true;
                }
                a.add(Integer.parseInt(message));
                initLineChart(a);
                shou.setText(message);
            }else {
                Log.i(MQTTService.TAG, "get message1:" + message);
                //Log.i(MQTTService.TAG,"get message1:"+mqttMessage);
                Toast.makeText(this, mqttMessage.getMessage(), Toast.LENGTH_SHORT).show();
            }
    
        }
    
        @Override
        protected void onDestroy() {
            EventBus.getDefault().unregister(this);
            super.onDestroy();
        }
    
    
    
        //
    
    
        /**
         * 初始化曲线图表
         *
         * @param list 数据集
         */
        private void initLineChart(final List<Integer> list)
        {
            //显示边界
    
            chart.setDrawBorders(false);
            //设置数据
            List<Entry> entries = new ArrayList<>();
            for (int i = 0; i < list.size(); i++)
            {
                entries.add(new Entry(i, (float) list.get(i)));
            }
            //一个LineDataSet就是一条线
            LineDataSet lineDataSet = new LineDataSet(entries, "");
            //线颜色
            //lineDataSet.setColor(Color.parseColor("#F15A4A"));
            //线宽度
            lineDataSet.setLineWidth(1.6f);
            //不显示圆点
            lineDataSet.setDrawCircles(false);
            //线条平滑
            lineDataSet.setMode(LineDataSet.Mode.HORIZONTAL_BEZIER);
            //设置折线图填充
    //        lineDataSet.setDrawFilled(true);
            LineData data = new LineData(lineDataSet);
            //无数据时显示的文字
            chart.setNoDataText("暂无数据");
            //折线图不显示数值
            data.setDrawValues(false);
            //得到X轴
            XAxis xAxis = chart.getXAxis();
            //设置X轴的位置（默认在上方)
            xAxis.setPosition(XAxis.XAxisPosition.BOTTOM);
            //设置X轴坐标之间的最小间隔
            xAxis.setGranularity(1f);
            //设置X轴的刻度数量，第二个参数为true,将会画出明确数量（带有小数点），但是可能值导致不均匀，默认（6，false）
            xAxis.setLabelCount(list.size() / 6, false);
            //设置X轴的值（最小值、最大值、然后会根据设置的刻度数量自动分配刻度显示）
            xAxis.setAxisMinimum(0f);
            xAxis.setAxisMaximum((float) list.size());
            //不显示网格线
            xAxis.setDrawGridLines(false);
            // 标签倾斜
            xAxis.setLabelRotationAngle(45);
            //设置X轴值为字符串
            xAxis.setValueFormatter(new IAxisValueFormatter()
            {
                @Override
                public String getFormattedValue(float value, AxisBase axis)
                {
                    int IValue = (int) value;
                    CharSequence format = DateFormat.format("MM/dd",
                            System.currentTimeMillis()-(long)(list.size()-IValue)*24*60*60*1000);
                    return format.toString();
                }
            });
            //得到Y轴
            YAxis yAxis = chart.getAxisLeft();
            YAxis rightYAxis = chart.getAxisRight();
            //设置Y轴是否显示
            rightYAxis.setEnabled(false); //右侧Y轴不显示
            //设置y轴坐标之间的最小间隔
            //不显示网格线
            yAxis.setDrawGridLines(false);
            //设置Y轴坐标之间的最小间隔
            yAxis.setGranularity(1);
            //设置y轴的刻度数量
            //+2：最大值n就有n+1个刻度，在加上y轴多一个单位长度，为了好看，so+2
            yAxis.setLabelCount(Collections.max(list) + 2, false);
            //设置从Y轴值
            yAxis.setAxisMinimum(0f);
            //+1:y轴多一个单位长度，为了好看
            yAxis.setAxisMaximum(Collections.max(list) + 1);
    
            //y轴
            yAxis.setValueFormatter(new IAxisValueFormatter()
            {
                @Override
                public String getFormattedValue(float value, AxisBase axis)
                {
                    int IValue = (int) value;
                    return String.valueOf(IValue);
                }
            });
            //图例：得到Lengend
            Legend legend = chart.getLegend();
            //隐藏Lengend
            legend.setEnabled(false);
            //右下添加描述
                if (aa&&aaa) {
                    chart.getDescription().setText(data_list.get(2));
                } else if(!aa&&aaa){
                    chart.getDescription().setText(data_list.get(1));
                }
    
    
            //隐藏描述
            //Description description = new Description();
            //description.setEnabled(false);
            //chart.setDescription(description);
            //折线图点的标记
            //MyMarkerView mv = new MyMarkerView(this);
            //chart.setMarker(mv);
            //设置数据
            chart.setData(data);
            //图标刷新
            chart.invalidate();
        }
    
    
    
    
    }

demo下载：[https://download.csdn.net/download/xurQQ/13090390][https_download.csdn.net_download_xurQQ_13090390]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1clFR_size_16_color_FFFFFF_t_70]: /images/20221120/2a53d4fe49794c5390327fc15502d764.png
[https_github.com_PhilJay_MPAndroidChart]: https://github.com/PhilJay/MPAndroidChart
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1clFR_size_16_color_FFFFFF_t_70 1]: https://img-blog.csdnimg.cn/20201105194826878.png?x-oss-process=image/watermark,type_ZmFuZ3poZW5naGVpdGk,shadow_10,text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3h1clFR,size_16,color_FFFFFF,t_70
[https_download.csdn.net_download_xurQQ_13090390]: https://download.csdn.net/download/xurQQ/13090390